KR20080016123A - Parallel boost bilateral control switch inverter - Google Patents

Abstract

A parallel boost bilateral control switch inverter is provided to use counter electromotive force in an electromotive mode as boost voltage and obtain higher torque by matching an output-direction magnetic flux of the counter electromotive force with a power input-direction magnetic flux of the electromotive mode in a regenerative mode. A parallel boost bilateral control switch inverter comprises a rectifying circuit(20), regenerative control circuits(22,23), bilateral control switch inverters(22,24), and a bipolar YY connected magnetic circuit(25). The regenerative control circuits include power control switches(223,243) and charge and discharge control switches(224,244). The power control switches control power supply and power cutoff to the bilateral control switch inverters between (+) lead lines of smoothing capacitors(226,246) and power supply connection terminals(227,247) of the bilateral control switch inverters. Collector regions of the charge and discharge control switches are connected to (+) lead lines of regenerative energy charge and discharge capacitors(225,245) in series. Emitter regions of the charge and discharge control switches are connected to the power apply connection terminals of the bilateral control switch inverters. The regenerative control circuits are connected to power lines between (-) lead lines of the regenerative energy charge and discharge capacitors and the (+) lead lines of the smoothing capacitors.

Description

 Parallel boost bilateral control switch inverter

Figure 1a is a winding of the conventional magnetic circuit and the step-up inverter circuit diagram;

1B is an explanatory view of a conventional principle of energy conversion (electric mode, regenerative mode);

Figure 2a is a configuration diagram of the butter circuit of the bipolar YY connection and parallel boost type bidirectional control switch of the present invention;

2B is an initial operation explanatory diagram of a parallel boost type bidirectional control switch inverter of the present invention;

2C is an explanatory view of an alternate operation of the parallel boost type bidirectional control switch inverter of the present invention;

3 is a switching sequence diagram of a parallel boost type bidirectional control switch inverter of the present invention;

The present invention provides a parallel configuration of a booster inverter in which an inverter composed of a bidirectional control switch circuit and a regenerative control circuit including a charge / discharge capacitor, a charge / discharge control switch, and a power control switch are configured in parallel, and a bipolar YY connection. The two-pole △△ connected electric motor and transformer are connected to each other to generate power and mutual induction, and the counter-electromotive force is charged to the capacitor and then discharged at the time of electric mode conversion. In particular, the present invention relates to a parallel boost type bidirectional control switch inverter configured to control the counter electromotive force with a bidirectional control switch in regenerative mode so that the counter electromotive force is used as a torque.

As shown in FIG. 1A, the general inverter and the boost type inverter that have been used up to now store the surge-type counter voltage generated in the switch-off of the inverter in the capacitor 5 of the boost circuit 4. The stored energy is configured to be applied to the inverter by using the discharge control switch 6 of the boosting circuit. However, since the energy storage amount is small, the complete boosting is not possible. Since the voltage can be applied only in the form of an impulse voltage, the boosting is not the purpose but the current density. It was only for the purpose of improving it slightly.

In order to improve the energy utilization efficiency as energy resources become scarce materials, the winding method of magnetic circuit is changed to parallel winding in order to recycle back EMF to regenerative energy, and it consists of two-way control switch circuit and regenerative control circuit instead of one-way control switch. By connecting the parallel multi-way bidirectional control switch inverter, the motor mode 9 and the regenerative mode 10 shown in FIG. 1B can be simultaneously implemented and the mode conversion can be implemented simultaneously. In the regenerative mode, the direction of counter electromotive force is controlled. Therefore, a new inverter circuit using back electromotive force as a torque was required.

The present invention has been made to solve this problem, and its purpose is to use the stray current of the coil generated by turn-off of the inverter and the counter electromotive force generated by mutual induction in the electric mode as regenerative energy.

Another object of the present invention is to use the counter electromotive force as a boosting power in the electric mode and to use the higher torque by matching the output direction magnetic flux of the counter electromotive force with the power input direction magnetic flux in the electric mode.

 According to an aspect of the present invention for achieving the above object, the present invention provides an inverter comprising a bidirectional control switch circuit comprising a unidirectional control switch in reverse parallel;

Between the smoothing capacitor (+) lead wire and the power supply terminal of the inverter, and the power supply control switch to control the power supply and the power supply to the bidirectional control switch inverter, and the anti-parallel diode is connected. The collector part of the control switch is connected in series with the positive lead wire of the regenerative energy charge / discharge capacitor, and the emitter part of the charge / discharge control switch with the antiparallel diode is connected to the power supply of the bidirectional control switch inverter. A regenerative control circuit configured to be connected to an applied connection terminal and configured to be connected together with a power line between a (-) leader line and a smoothing capacitor (+) lead line of the regenerative energy charge / discharge capacitor;

Step-up bidirectional control switch inverter provided with;

Multi-phase motors and multi-phase transformers connected with two-pole YY and two-pole △△;

A parallel boost type bidirectional control switch inverter connected to a bipolar three-phase connection of the inverter; Is provided.

 The principle and operation of this configuration are as follows.

FIG. 2A is a circuit diagram of a bipolar YY connected magnetic circuit and a parallel multiplication type bidirectional control switch inverter circuit of the present invention. For convenience, the magnetic circuit connected to the bipolar YY connected magnetic circuit is applied.

The present invention includes a rectifier circuit 20 for rectifying AC into a direct current, a regenerative control circuit 21 and 23 configured in parallel, and an inverter circuit 22 and 24 configured in parallel with a bidirectional control switch circuit. It is composed.

In more detail, the configuration of the regenerative control circuits 21 and 23 includes a smoothing capacitor (226, 246) lead wire and a power supply connection terminal (227, 247) of the bidirectional control switch inverter (22, 24). Of the charge / discharge control switches 224 and 244 having the reverse parallel diode fastened therebetween, and the power control switches 223 and 243 for controlling the power supply to the bidirectional control switch inverters 22 and 24 and controlling the power interruption. The collector part is connected in series with the (+) leader line of the regenerative energy charge / discharge capacitors 225 and 245, and the emitter part of the charge / discharge control switch 224 and 244 to which the anti-parallel diode is connected. (-) And smoothing capacitors (226, 246) and (+) lead wires of regenerative energy charge / discharge capacitors 225, 245 are configured to be connected to the power supply connection terminals 227, 247 of the inverters 22, 24. It is configured to be connected together with the power lines 228 and 248 therebetween.

The bidirectional control switch inverters 22 and 24 are composed of two bidirectional control switches 26 in which the unidirectional control switches are configured in reverse parallel, and six in three phases. It is separated into 2 (24). In the present invention, the bidirectional control switch inverter 1 (22) and the bidirectional control switch inverter 2 (24) are configured in parallel.

The two-pole YY connection (including the two-pole △△ connection) of the magnetic circuit 25 has a winding direction different from that of the Y-wire 257 composed of the UL1 coil winding 251, the VL1 coil winding 252, and the WL1 coil winding 253. It consists of a Y-wire 258 composed of one UL2 coil winding 254, VL2 coil winding 255, WL2 coil winding 256

The Y connection 257 composed of the UL1 coil winding 251, the VL1 coil winding 252, and the WL1 coil winding 253 is connected to the inverter 1, and the UL2 coil winding 254 and the VL2 coil winding having different winding directions ( 255, Y-wire 258 composed of the WL2 coil winding 256 is connected to the bidirectional control switch inverter 2.

This bipolar YY connection is connected so that the same magnetic pole is formed even if the direction of the current flowing in one Y connection and the current flowing in the other Y connection is reversed, so that the direction of applying power in the electric mode and the output direction of the counter electromotive force in the regenerative mode This is to prevent the self-offset by.

2b is a view for explaining the operation of the parallel boost type bidirectional control switch inverter connected to the two-pole YY-connected magnetic circuit 25 of the present invention. Referring to the operation of the electric mode and the regenerative mode for the initial operation as follows. same.

S1 electric mode switch 211 of power control switch 223 and bidirectional control switch inverter 1 22, based on the switching sequence 31 shown in the 4-pole three-phase switching sequence diagram of FIG. When the S4 power mode switch 214, the S8 regenerative mode switch 218, the S9 regenerative mode switch 219, and the S5 bidirectional switches 215 and 221 are turned on, the power is supplied to the UL1 coil 251 and the WL1 coil 253. ) Is combined in the VL1 coil 252, and the power circuit is composed of the (-) stage and the smoothing capacitor 226. In the magnetic circuit 25, the operation angle of 0 ㅀ to 30 ㅀ and the operation angle of 0 ㅀ to 60 ㅀ is applied. Done.

However, the reason why the S8 regenerative mode switch 218, the S9 regenerative mode switch 219, and the S5 regenerative mode switch 221 are turned on even though the bidirectional control switch inverter 1 22 operates in the electric mode is because of the electric mode. This is to change the magnetic flux for the next operation in the magnetic circuit 25 by controlling the direction of the reverse electromotive force generated by the reverse potential difference when the power is cut off by the turn-off.

On the contrary, in the coil of the Y connection 258 connected to the bidirectional control switch inverter 2 24, the UL 2 coil 254 and the WL 2 coil by the power flowing to the VL 1 coil 252 along the UL 1 coil 251 and the WL 1 coil 253. Mutual induction occurs at 256 and VL2 coil 255, and at the same time back EMF occurs in the synchronous motor. The mutually induced power and the counter electromotive force generated in this way are turned on in the S19 regenerative mode switch 237, the S22 regenerative mode switch 240, and the S23 regenerative mode switch 241, and the UL 2 coil 254 along the VL 2 coil 255. And the WL2 coil 256 are charged to the regenerative energy charge / discharge capacitor 245 through the antiparallel diode of the charge / discharge control switch 244.

At this time, since the applied voltage has a higher potential difference than the counter electromotive force, the applied voltage must be turned off by turning off the power supply control switch 243 of the regenerative control circuit 2 (23).

If the applied voltage is not blocked, it is difficult to convert the counter electromotive force into regenerative energy. Only the surge voltage, which appears when the switch is on or off, is stored in the capacitor.

However, the direction of the applied current and the current of the counter electromotive force are opposite to each other, but because the coil windings are separated and the winding direction is different, the magnetic amplification phenomenon and the torque are improved.

One thing to watch out for here is self-saturation. Current control is required to prevent self saturation.

FIG. 2C is an explanatory view of an alternate operation of the parallel boost type bidirectional control switch inverter of the present invention to explain the alternate operation driving method.

Switch the bidirectional control switch inverter 1 (22) and the power control switch 223 used in the electric mode to the regenerative mode and turn off the regenerative mode switch of the bidirectional control switch inverter 2 (24) used in the regenerative mode. The shifting to is called shift operation drive.

When the power control switch 223 and the bidirectional control switch inverter 1 22 turn off the S1 power mode switch 211, the S4 power mode switch 214, and the S5 power mode switch 215, the UL1 coil 251 and WL1 are turned off. The power that is combined in the VL1 coil 252 and flows to the (-) stage along the coil 253 is converted into counter electromotive force and is connected to the S8 regenerative mode switch 218 from the (-) stage. And charges the regenerative energy charge / discharge capacitor 225 through the anti-parallel diode of the charge / discharge control switch 224 via the S9 regenerative mode switch 219 and the S5 regenerative mode switch 221 along the VL1 coil 252. do.

The counter electromotive force passes the UL1 coil 251, the WL1 coil 253, and the VL1 coil 252 to induce magnetic flux as shown in the switching sequence 32 of FIG. 3, and the bidirectional control switch inverter 2 (23) is converted to the electric mode. Before the power is applied, the magnetic circuit 25 is switched to the next operation mode to operate.

Since the counter electromotive force is made in a very short moment, the power must be applied by switching the bidirectional control switch inverter 2 (23) to the electric mode.

The power supply method at this time is based on the sequence 32 of the inverter 2 (24) shown in the switching sequence diagram of Fig. 3 to operate the machine angles of 30 to 60 Hz and the electrical angle of 60 to 120 Hz. S15 motor mode switch 233 of the bidirectional control switch inverter 2 (24) by boosting power synthesized by turning on the control switch 223 and the charge / discharge control switch 244 by application of power and discharge of regenerative energy; S17 motor mode switch 235 S14 motor mode switch 232 together with the switching sequence 43 of FIG. 3 S24 regenerative mode switch 242 for control of back EMF based on machine angle 60 kW to 90 kW electric angle 120 kW to 180 kW ), S19 regenerative mode switch (237) When the S21 regenerative mode switch (239) is turned on, the boosted power is VL2 (255) coil connected to the S15 motor mode switch 233, and WL2 connected to the S17 motor mode switch 235. Along the coil, it passes through the UL2 (254) coil and the S14 motor mode switch 232 to the (-) end, ㅀ to 60 ㅀ, electric angle 60 전기 to 120 ㅀ.

When the power is controlled in this way, the electric motor rotates and the counter electromotive force is used as regenerative energy and torque for boosting, thereby reducing external energy consumption.

In addition, the present invention provides a pulse amplitude modulation (PAM) control scheme.

Optimum control can be realized by selectively using a PWM (pulse width modulation) control method.

A feature of the present invention is that the simultaneous operation of the electric mode and the regenerative mode is possible, and to control the traveling direction of the counter electromotive force to reduce the external energy consumption by using as a boost power.

Fig. 3 shows a switching sequence for three-phase operation, which is a reference for electric mode and regenerative mode control.

 The parallel step-up bidirectional control switch inverter of the present invention has a coil and an inverter separated to enable simultaneous operation with mode switching between the regenerative mode and the electric mode, and controls the direction of the counter electromotive force in the electric mode, thereby improving the amount of counter electromotive force and magnetic induction characteristics. Predictive motion control is possible.

The parallel step-up bidirectional control switch inverter of the present invention is a three-phase bipolar connection and bidirectional control configured in consideration of the fact that the current direction (Fleming's left-hand law) in the electric mode and the regenerative mode current direction (Fleming's right-hand law) work in reverse. It is a three-phase parallel step-up bidirectional control switch inverter that consists of a booster bidirectional control switch inverter composed of a switch circuit and a regenerative control circuit in parallel. Therefore, it boosts the self-amplification that controls the counter electromotive force in the regenerative mode and the boosted power that discharged the regenerative energy in the electric mode. Will be made. However, this energy is conserved because the energy applied for the action is converted into reaction energy.

Therefore, the present invention can be used as a function utilizing the reaction energy can reduce the external energy consumption. In particular, self-amplification and boosting by back EMF have the effect of prolonging the number of batteries and the discharge time when used for electric motor drive.

Claims (1)

An inverter composed of a bidirectional control switch circuit having the unidirectional control switch in reverse parallel; Between the smoothing capacitor (+) lead wire and the power supply connection terminal of the bidirectional control switch inverter, a power control switch for controlling the power supply and the power cutoff of the bidirectional control switch inverter, and the antiparallel diode The collector part of the charge / discharge control switch is connected in series with the (+) lead wire of the regenerative energy charge / discharge capacitor, and the emitter part of the charge / discharge control switch with the antiparallel diode is connected to the bidirectional control switch. A regenerative control circuit configured to be connected to a power supply connection terminal of the inverter and configured to be connected together with a power line between a (−) leader line and a smoothing capacitor (+) lead line of the regenerative energy charge / discharge capacitor; Step-up bidirectional control switch inverter provided with; Multi-phase motors and multi-phase transformers connected with two-pole YY and two-pole △△; Parallel boost type bidirectional control switch inverter with bipolar three-phase connection

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